Bill Downs on wed 11 nov 98
A question for the glaze guru's. I'm searching for a food safe white liner
cone 10-11, preferably not to glossy. I've used one called Satin White with a
formula of:
Custar Spar 3200g
Silica 1600g
Whiting 1600g
Talc 1200g
EPK 1800g
Bentonite 160g
Superpax 400g
I guess the net has made me concerned about using a glaze that generally
crazes
on the bodies that I utilize and calling it food safe.However,I personally
love the way this glaze looks in a mug after many good years of use. I refer
to this as a craze stained interior, these are like wine (a good cabernet)
they only get better with age. Does anybody out there relate? Well, thanx for
any help on the glaze.
BILL ON THE BIG ISLAND
June Perry on thu 12 nov 98
In a message dated 11/11/1998 6:00:42 AM Pacific Standard Time, BDUDEE@AOL.COM
writes:
<< BDUDEE@AOL.COM >>
Bill,
A quick fix might be to just reverse the amounts for the whiting and talc. The
talc has a lower co-efficient of expansion than the whiting and a little more
silica. Both of those can help lower the expansion of the glaze.
Warm regards,
June
Ron Roy on fri 13 nov 98
Hi Bill,
It's a little short of silica but not enough to worry about - I have
reformulated for more silica and could get rid of the crazing as well - but
since you like it....
I don't think there is a problem with crazing glazes and food - in fact
there may be a benefit. Getting a micro shot of botulism every day may be
just the thing to keep your immune system on it's toes.
Here is a reformulation - may be still too shiny but that is fixable - I've
kept the expansion about the same.
After you test it report back to the list with the results please - what I
am trying to achieve is the same looking glaze but a little more durable -
RR
Revised by RR for more durability
-----------------
CUSTER SPAR......... 36.00
SILICA.............. 20.00
WHITING............. 17.00
TALC................ 10.00
EPK................. 17.00
BENTONITE........... 2.00
ZIRCOPAX............ 4.50
----------
106.50
FORMULA & ANALYSIS
------------------
*CaO........ .58 11.37%
MnO2....... .00 .02%
*MgO........ .24 3.42%
*K2O........ .12 4.07%
*Na2O....... .06 1.30%
Fe2O3...... .01 .32%
TIO2....... .00 .06%
AL2O3...... .40 14.28%
SiO2....... 3.09 65.14%
P2O5....... .00 .02%
RATIO 7.76 (org is 7.27)
EXPAN 470.40 ( org is 471.47)
WEIGHT 284.37
>----------------------------Original message----------------------------
> A question for the glaze guru's. I'm searching for a food safe white liner
>cone 10-11, preferably not to glossy. I've used one called Satin White with a
>formula of:
> Custar Spar 3200g
> Silica 1600g
> Whiting 1600g
> Talc 1200g
> EPK 1800g
> Bentonite 160g
> Superpax 400g
>I guess the net has made me concerned about using a glaze that generally
>crazes
>on the bodies that I utilize and calling it food safe.However,I personally
>love the way this glaze looks in a mug after many good years of use. I refer
>to this as a craze stained interior, these are like wine (a good cabernet)
>they only get better with age. Does anybody out there relate? Well, thanx for
>any help on the glaze.
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
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